Hiram raises earthworms. In a square of compost 4 ft by 4 ft, he can have 1,000 earthworms. How many earthworms can he have if his square of compost has a side length that is 7 times longer? Help please?
no of earthworm is proportional to the area of the plot
1000 ~ 4*4 (let ~ stand for proportional)
now sides are 7 times longer
(7*4)*(7*4) =7*7*(4*4)
we already know (4*4)~1000
so =7*7*1000=49000